Tube-boring machine.



J. ROWE.

TUBE BORING MAGHINH.

APPLICATION FILED MAY 10, 1909.

Patented June 20, 1911.

J. ROWE.

TUBE BORING MACHINE.

APPLICATION FILED MAY 10. 1909. v

Patented June 20, 1911.

5 SHEETS-SHEET 2 r 1 y I H M. u

.Ivzu e n J. ROWE.

TUBE BORING MACHINE.

APPLIOATION'FILED MAY 10. 1909.

gg5fl57gn Patented June 20,1911.

5 8HEETSSHEBT a.

1; A j i M5 4 Q; a 46 X 35 if J. ROWE.

TUBE BORING MACHINE.

APPLIOATION FILED MAY 10, 1909.

5?2, Patented June 20, 1911.

5 SHEETS-SHEET 4.

, II. ROWE.

TUBE BORING MACHINE. I

APPLICATION FILED MAY 10, 1909. 995,572. 7 Patented June 20, 1911.

'5 sums-sum a.

Fri,

an mus ROWE, or onrcaeo, rumors.

TUBE-BORING MACHINE.

' Specification of Itetters Patent.

Patented June 20, 1911.

Application filed May 10, 1909. Serial No. 495,179.

To all whom it 'nuz'y concern:

Be it known that I, JAMES Rowe, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Tube-Boring Machines; and I- do hereby declare the following to be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a novel constructlon in a machine for finishing the bores of tubular bodies and has for its object to pr ovide a simple and efiicient machine of this character, and consists in the features of construction and combinations of parts hereinafter fully described and claimed.

In the accompanying drawings illustrating this invention: Figure -1 is a view in side elevation partly broken away of a machine constructed in accordance with my in ventlon. F 1g. --2 1s a slmllarv1ew partly I in longitudinal section of the same looking from the opposite side thereof. Fig. -3-- is a vertical transverse section on the line 33 of Fig. 1. Fig. 4 is a detail vertical longitudinal section on the line4-4 of Fig. -3-. Fig. -5 is a detail longitudinal section on the line 5- 5 of Fig. 4.'. Fig. 6- is a fragmentary detail side elevation showing means employed for operating the split nut constituting part of the mechanism. Fig. 7- is a vertical transverse section on the line 7 -'7 of Fig. --l-. Fig. 8' is a vertical transverse section on the line 88 of Fig. 1 Fig. 9 is a detail vertical longitudinal section on the line 99 of Fig. -3. .Fig. 10-- is a fragmentary detail section of a disk employed taken on the line 1010 of Fig.

7 8. Fig.'-11 is a view in side elevation of the boring tool employed. Fig. 12-is an end elevation of the same. Fig. -13- is a plan section on the line 13-13 of Fig. -'12-. Fig. -14 is a detail vertical section on the line l t-14 of Fig:

-- 13. Fig. 15- is a detail vertical section on the line 1515 of Fig. -12. I The main object of my invention is to provide means for boring out a tube in such a manner as to prevent any of the shavings from finding their way behind the cutting or boring head and scratching and marring the finished surface of the tube.

A further object of the invention is to other heavy structures.

provide very simple and eflicient means whereby an absolutely true bore is assured without necessitating the extraordinarily heavy machine structures usually necessary to the accomplishment of this purpose where the diameter and length of the tube are such as to render deviation from the true course readily possible.

Other objects of the invention are to provide means whereby the ejection of shavings and cooling of the cutting tool are assured, and the provision of simple and eflicient means for mounting and rotating the tube and controlling the working parts of the machine. v

My inventionconsists particularly in disposing the tube to be bored true at a slight liquids so as to direct the latter most advantageously and economically to wash away all shavings and eject them from the lower end of the tube.

The invention consists further in the particular construction of the boring head and in certain details of construction of the machine.

The machine is designed particularly for boring out brass lined iron or steel tubes used in the construction of molds for casting inking rolls for printing presses but may obviously be employed for boring out all kinds of tubular bodies including guns and The machine is not, however, designed or intended to be used for boring solid bodies but isdesigned essentially as a finishing tool for bores (previously of the work. In finishing operations, however, a single shaving finding its way back into the finished portion of the bore may so scratch and mar the surface as to completely ruin the device, since reboring would necessarily so enlarge the bore as to .make it greater than the desired standard and would, therefore, fail to correct the evil accomplished.

It is of course an essential requisite of machinery that it shall not only accomplish its object but shall do so in the most economical manner possible and shall not require the attendance of expert mechanics to insure such accomplishment, and in designing the present machine I have kept this requisite in mind and have further aimed to maintain the cost of the machine. as low as possible consistent with the class of work for which it is intended.

The bed 1 of the machine is supported on a relatively slight incline and consists of two parallel members resembling I-beams in cross section such shape being advantageous because of its great stifi'ness and rigidity in proportion to weight. On the said beam 1 are mounted two bearings 2-- and 3 respectively, the bearing 2- being disposed at the lower end and the bearing 3 substantially midway between the ends of said bed, the common axes of said bearings being parallel with said beams and midway between the same though disposed at a higher elevation. The exact positions of the said bearings may obviously be varied to suit various requirements. Each of said bearings 2 and 3 is adapted to receive a bushing 4-+ having a central stepped opening 5 in the larger end portions of which the ends of the tube 6-- to be bored true is revolubly disposed and held against the longitudinal movement relatively to said bearings and to the bed 1. The said bushings -4. are interchangeable and have varyingsizes of central openings to accord with tubes of varying diameter to be operated upon. The smaller portions of the openings 1n said bushings are substantially equal though preferably slightly greater in diameter than the bore of the tubewhen finished, the annular shoulders between the ends of said openings serving as thrust bearings for the tube. Said bushings are secured in the hearings in any suitable manner such, for example as the set screws ings -2 and -3- is a bearing 8- in which the hub --9-' of the bevel gear 10- and disk 11- is journaled, said gear and disk being preferably integral with each other. The said hub -9- is hollow a'nd 1s adapted to receive a bushing -12 having a central opening corresponding in diameter substantially withthe tube 6 5 and disposed in am'al alinement with the Substantially midway between the bear-' openings in the bushings 4-. It is essen tial of course that the axis of rotation of the 20 and 21 which are adapted to be manipulated in any suitable and well-known manner to constitute gear and which transmit motion from the spur gear -19- to the spur gear 22 and thence to the spur gear -23 on the screw shaft --24' actuating the tool carriage 25. I r The specific means employed for manipulating the spur pinions 20 and 21 to reverse the movement of the screw shaft 24: relatively to the bevel gear 10 is not illustrated, this being deemed superfluous in view of the common knowledge of such means. The bushing 12 is suitably secured within the hub 9 of said bevel gear 10 although means for securing the same are omitted from illustration. Said bushings are also interchangeable to accommodate various diameters of tubes to be operated upon. The said'disk 11 is provided with a diametrically disposed T-slot'26 in which the heads of bolts 27 are received; the threaded shanks of said bolts projecting from said equipped with nuts 28 by means of which the same may be secured at varying distances from the center of said disk.

The tube 6 is clamped between two'blocks 29 of wood for other suitable material provided in their opposing faces with recesses 30 corresponding in radius with the tube adapted to be received therein, said blocks being secured together by means of bolts 31 passing through the same on either side of the recesses therein and are drawn together by means of said bolts so as to firmly clamp the tube 6 between the same and prevent rotation thereof relatively to said blocks. The said blocks 29 are mounted upon said tube 6 adjacent the said disk 11 and after being secured thereon the said bolts 27 are. adjusted in position in said slots 26 so that the shanks thereof engage the heads of said bolts 21 and by such engagement cause said blocks 29 and said tube 6 to rotate with said disk 11, as will be obvious. The wooden blocks being relatively softer than the metal of the tubes will not indent or injure the latter and at the'same time afford a very powerful frictionalhold thereon which will prevent" slippage of the tubetherein. A

25, said plate 32 being equipped with side flanges of said side pieces of the bed. Said plate 32 thus serves to guide said tool .carriage in its longitudinal movements on said bed and prevents lateral and vertical movement thereof.- One ofthe sideflanges 34 of said carriage 25 is provided with vertical slots 35 which extend through the verticalT-shaped guide recess 36 in the inner .face of said flange 34, the two members 37 of a split nut engaging the screw shaft 24 are slidably mounted. Each of said memvbers'37 of said nut is provided with a pin 38*passing through said vertical slots 35 and entering the cam slots 39 in a disk 40 revolubly mounted in a suitable manner on the outer face of said flange 34, the axis of rotation of said disk being perpendicular to and in horizontal ,alinement with the axis of rotation of said screw shaft-24. 'By rotatmg sa1d disk 40 through an arc of substantially degrees the said pins 38 will be moved radially relatively thereto, thus e1ther opening or closing said nut 37 and throwmg same out of or into engagement with said screw shaft 24.

On the outer upper flange of the side piece of the bed 1 on the oppositeside from the flange 34 of said carriage 25 is mounted a rack 41 whichmeshes with a spur pinion 42 rigidly mounted on the hub 43 of a spur gear 45 rotating on a stud carried by the flange 44 of said carriage 25. The said spur gear 45 which in turn meshes with a spur pinion 46 on the crank shaft 47 journaled in a bearing in said flange 44, the

crank 48 of said crank shaft 47 being adapted to be rotated to move the tool carriage 25 when the split nut 37 is opened to release the screw' shaft 24. The above described means for imparting movement to the said tool carriage 25 either by means of the power actuatedscrew-shaft or by means of the hand actuated crank 48 are both well known.

' On the tool carriage 25 is mounted ,a standard 49 terminating at its upper end in a split collar 50 n which the stem'51 of theborlng head 52 is securely held. The axls of sa1d split collar 50 is coincident with the axis of rotation ofthe tube 6 and the said stem 51 of said boring head is held therein against rotation and also against Y51 and receives the lubrlcating fluid from longitudinal movement relatively thereto. The said boring head 52 corresponds in diameter exactly with the diameter of the finished bore of the tube and is of considerable length, so that it attains a long bearing in said finished bore. Said boring I head y is cut out longitudinally for almost its entire length. at one side, the recess 53 formed in said side havin respectively perpendicular walls'onc of w ich lies in a radial plane of said head. The last named wall I will describe as the horizontal wall of said recess and on thesame the cutting tool 54is secured by means of the screws 55. The forward end of said head 52 is of helical .form and attains the greatest projection atthe forward end of said horizontal wall of said recess 53 so that the, cutting edge of said cutter 54 is disposed. or projected in advance of the body of said head 52 and enlarges the bore sufficiently to receive the latter and to provide a running fit between the same and the finished bore, said headserves to maintain itself centered with relation to the tube'being bored, and in and of itself prevents any deviation from the true course in effecting the bore. The stem 51 of said head is hollow and communicates at its free end with a source of supply of a lubricating'fiuid under pressure by means of -aflexible tube 56 or in any other suitable manner. The head 52 is preferably cored to provide ahollow space 57 therein which communicates'with the o ening in the stem the latter. Openings 58 extend at an incline from the vertical wall of the recess 53 into said hollow 57, said openings being disposed in the plane of the upper face of the cutter 54 and serving to throw jets of lubricating fluid over the surface of said cu tter and in the direction of motion of sa1d head 52 therebywash-ing out of said recess 53 and into the unfinished portion of the bore of the tube all shavings removed by said tool. The shavings thus washed away will lodge in thelowermost port-ionof the bore, and to further project the same toward the lower end of the tube I provide an opening 59 extending at an incline from the 1 .lower forward edge of the head 52 into the vout of the lower end of said tube 6.

In machine work it not infrequently happens that the wet surfaces of the bore cause the shavings, especially the smaller and lighter variety to adhere to the wall of Y the bore and be constantly rotated thereby.

I desire to direct attention to the fact that owing to the inclination of the tube any shavings carried around by adhesion to the wall of the bore would be obliged to pass into the 139 path of the stream of liquid projected through the opening 59 and thus be washed gradually away from the forward end of the boring tool and would be thus positively prevented. from finding their way back of the foremost end of said cutting head. Very small streams projected through said openings 58 and 59- will thus serve to keep the finished portion of the bore absolutely clear' to employ a relatively light stem for said head and am further enabled to avoid the use of long and heavy guiding devices which would insure true travel of said boring head. The machine thus becomes light and cheap in construction which is obviously very advantageous. Furthermore, the machine will not suffer inaccuracy of operation by reason of any wear on the guides generally employed on machines adapted to produce bores of great length and relatively largediameter, as each tube in and of itself constitutes the guide for the said cutting head 52.

I desire to call attention to the fact that the bushing 4 in the bearing 3 is of relatively great length, and that the greater portion of the central opening therein is of the same diameter as the finished portion of the tube and serves to primarily receive and guide said head into the tube in proper axial alinement with the latter. Thus theboring head is given a true start and is thereby 'enabled to maintain a true course throughout the length of the bore, I believe that this 7 feature is entirely novel in the art, and while the rotation of thework to be bored is not entirely novel in the art of machine work, I

believe the specific devices employed for.

' rotatably supporting and revolving said 7 tube to be novel.

The rotation of the tube instead of the v boring head together with the inclination of the axis of rotation of said tube confers advantages which would not be present were the conditions reversed, that is to say, the revolutions of the tube in place of the head causes allshavings to be primarily deposited upon a horizontal surface projectin beyond all other parts of the boring hea and causes the said shavings when washed off -said surface to be first carried to the lowermost point in the tube and directly into the path of the jet of liquid projected from-the opening 59. The shavings are thus immedlately carried as far as possible away from the foremost end of the head at the least possible expense of the lubricating liquid. If the boring head were rotated the same object could not ossibly be accomplished except at relatively very great expense of lubricating fluid, as the supply and flow of the latter would have to be maintained so great and at .so high a pressure as to insure a .very forcible washing away of every shaving before it could possibly drop by gravity upon what constitutes thevertical surface of the recess 53 and thence find its way between the periphery of the head and the finished bore. The cost of pumping liquid at a high pressure would have to be taken into consideration as would also the difiiculty of taking care of a large volume of the same and the consequent necessity for the occupation of greater space in the buildm I have herein referred to certain surfaces and planes as horizontal, which as a matter of fact, are inclined in one direction to correspond with the inclination of the axis of rotation of the tube. This is done merely for convenience and should not be accepted as literally defining said surfaces.

In Fig. 8 I' have illustrated conven ient means for regulating the flow of lubri- 61 in contact with the periphery of the disk 11, the latter being cut awayon a cord as at 65 thus constituting said disk, a cam imparting movement to the piston of the pump 1n one direction. An arm 66 of the bracket 63 carries a set-screw 67 disposed in the path of the first-named arm of the bell-crank lever 62 and limiting the movement of the said lever in one direction. Said set-screw enables the stroke of the pump 60 to be varied to vary the'volume of lubricating liquid passing through the boring head, the stem of the latter being connected with the delivery end of the said pump.

I claim as my invention: .1. In a machine of the kind specified, the combination with means for supporting and rotating a tube on its ownaxis', of a member having a stepped opening constituting a bearing for one end of sald tube, a boring head corresponding in diameter with the finished bore of the tube and movable axially through the latter, said boring head fit- 7 10 ment to said carriage in a direction parallel with the axis of rotation of said tube, of a carriage longitudinally adjustable onsaid bed, a bearing carried thereby disposed in axial alineinent with the tube, and a bushing in said bearing provided with a stepped central opening corresponding in diameter at one end with the outer diameter of said tube and constituting a bearing therefor, and correspondin in diameter at its other end with the finis ed bore of the tube and adapted to receive and initially guide said boring head into the latter. 3. In a machine of the'kind specified, the

combination with means for rotatin a tube on its own axis, of a boring hea corresponding in diameter with the finished bore of the tube, a; cutting tool carried thereby having its cutting edge disposed in the periphery thereof and projecting forward of the body ortion of thesame, aguide member provi ed' with an opening corresponding in size with the finished bore of said tube and supported on the lathe bed in axial alinement therewith at one end of the, same,

said guide member adapted to receive said boring head and initiallyguide the same relatively to said tube, a stem on said borin head, and acarriage engaged therewith .an adapted to impart longitudinal movement 40 thereto, said carria e being movable in a plane parallel with the axis of said tube.

4. In a machine of the kind specified, the

- combination with a lathe for rotating a tube onits own axis, of a boring head equipped.

with a stem supported at its free end portion in axial alinement with said tube, means for imparting longitudinal movement to said head, a guide supported on the lathe bed and disposed at one end of said tube and 0 having an opening concentric therewith and corresponding in diameter with the finished bore of the tube and adapted to receive and initially guide said boring head into said tube, said opening being enlarged at one end and at said end adapted to receive and constitute a bearing for said tube, said boring head corresponding in diameter with the finished bore of the tube andbeing of relatively eat length and being guided by the finishe portion of the bore in its further passage through said tube, and a cutting tool carried by said boring head and having its cutting edge disposed in the periphery of the latter, said cutting tool projecting forward of the main portion of said head.

'ished bore of the tube and bein finishe passage through said tube and into the lowermost portion of said tube 5. In a machine of the kind specified, the combination with a lathe for rotating a tube on its own .axis, of a boring head equipped with a stem supported at its free end portion in axial alinement with said tube, means for imparting longitudinal movement to said head, a guide supported on the lathe bed and disposed at one end of said tube and having an openingconcentric therewith and corresponding in diameter with the finished 1 bore of the tube and adapted to receive and .initially guide said boring head into said tube, said opening being enlarged at one end and at said end adapted to receive and conl stitute a bearing for said tube, said boring head corresponding in diameter with tfhe fiin- 0 re ativelyeat length and being gui ed by the portion of .the bore in its further and a cutting tool carried b said boring headand having its cutting e ge disposed in the periphery of the latter said cutting tool projectin forward of the main portion of said hea said head and stem being hollow and con- 'nected with a source of supply of lubricating liquid under ressure, t

-ere being discharge openings or said liquid adaptedto direct jets thereof over the said cutting tool 5 9 for projecting sha ings beyond the forward end of said head. I

6. A machine of the kind specified, comprisin an inclined supporting surface, a plurality of bearings mounted thereon at one end portion thereof, the outermost of said bearings being adapted to receive bushings having central openings in Wh1ch the ends of a tube are adapted to be journaled, said openings being contracted at one end each, driving means j ournaled in oneof said bearings between the last-named and being provided with a central opening for the passage of said tube therethrough, means for engaging said tube'with said driving means, a longitudinally movable non-rotatable boring head corresponding in diameter with the finished bore ofthe tube adapted to enter the same at its elevated end, said head adapted to Vfit and be initially guided into said end of said tube by the contracted portion of the openin in the bushing in which said end of said tu is journaled, said head being hollow and connected with a source of supply of a lubricating liquid under pi'essure and equipped with openings adapted to direct jets of said liquid to project shavings toward the lower end of said tube. I

7. A tube boring lathe comprising an inclined bed, a tool carriage movable thereon, 1 a driven rotating member having a hollow hub, a bearing between the ends of said bed in which said hollow hub is journaled bearings disposed beyond-either end of said bearing in axial alinement therewith, bushings mounted in said last-named bearings and in said hub, the first-named bushings being provided with stepped openings .larger at their Opposed ends and adapted to receive the end portions of the tube to be bored and constitute bearings therefor, the tube being adapted to pass through the bushing in said hub, means-for engaging said tube with said driven member, a non-rotatable boring head engaged with said tool carriage and adapted to pass axially through said tube, said means for actuatingv said tool carriage and said driven member.

8. A tube boring lathe comprising an inclined bed, a tool carriage movable thereon, a driven rotating member having a hollow hub, a bearing between theends of said bed in which said hollow hub is journaled bearings disposed beyond either end of said bearing in axial alinement therewith, bushings mounted in said last-named bearings and in said hub, the first-named bushings being provided with stepped openings larger at their opposed ends and adapted to receive the end portions of the tube to be bored and driven member, a non-rotatable boringhead equipped with a stem engaged at itsfree end portion with said tool carriage, said head fitting the contracted portion of the opening in the bushing receiving the elevated end of said tube and being ada ted to be initially guided thereby intosai tube, the diameter of said head corresponding with the diameter of the finished bore of the tube and said head being guided by the latter after leaving axially throu h said tube and means for actuating sai driven member and said tool carriage.

In testimony whereof I have si ed my name in the'presence of two subseri ing wit nesses.

JAMES Rows.

Witnesses RUDOLPH WM. Lo'rz, M. M. BOYLE.

said bushing to pass 

